On the official RuneScape forums back in the day, you'd see all kinds of people claiming they were falsely banned. Or their "friends" were falsely banned.
The most frequent reason for bans were people using bots to power-level or mine resources. The explanations people would come up with for why they had been playing for 81 straight hours were pretty funny. And there was ALWAYS an incriminating admission in the defense. Like, nobody knows why you were banned, you're posting from a burner account, but they always had some sort of cover-up for something super specific.
Like, "I have no idea why I was banned I never cheated or used any bots or anything. I play legit and I just lost my whole account after years of hard work. I was chopping a ton of wood lately, maybe that's why. But I definitely wasn't cheating I just needed a lot of wood and played straight through an entire weekend without talking to anybody or responding deviating from the same cyclical path:"
Or "I just had my level 100 account banned for no reason and I don't know why. I was doing everything normal. But I did fly to Phoenix from Boston this week and then back to Phoenix and then back to Boston and back to Phoenix for work. I absolutely wasn't account sharing. I have been banned in error!"